Tudor · Black Bay One

Strap for Black Bay 36 S&G / Black - Diamond / Bracelet

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter36 mm
Reference79643-0006 (aka: M79643-0006)
FamilyBlack Bay One
MovementTudor caliber MT5400 hours, minutes, seconds | chronometer
Year2022
CaseYellow Gold, Stainless Steel

Spring bar

Spring bars for Tudor

The right category for this model · choose the 19 mm size

Straps for the Black Bay One 79643-0006 (aka: M79643-0006)

Selected for the 19 mm lug width

All 19 mm straps →

The Black Bay One 79643-0006 (aka: M79643-0006), seen from the bench

The Black Bay One represents a unique piece created by Tudor for charitable purposes. It is powered by the automatic Calibre MT5400 with chronometer certification and hour, minute and second functions. The watch features 19mm lugs.

Frequently asked questions

What is the lug width of the Tudor Black Bay One 79643-0006?

The <a href="/pages/termine-glossario/misura-ansa">lug width</a> of the Tudor Black Bay One 79643-0006 is 19mm. This dimension is measured internally between the two lugs of the case and represents one of the most versatile sizes in contemporary strap production. A 19mm width opens access to a broad selection of aftermarket straps and allows for refined aesthetic tuning.

What is the best strap for the Tudor Black Bay One 79643-0006?

Selection depends on intended use and personal aesthetic preference. For the two-tone yellow gold and steel version, we recommend calf leather or <a href="/pages/termine-glossario/alligatore">alligator</a> in cognac or dark brown tones, which naturally dialogue with both case metals. For versatility, a rubber or military canvas strap offers comfort and practicality. Strap length must be personalised to individual wrist measurements.

How do you change the strap on the Tudor Black Bay One 79643-0006?

Strap changes are accomplished via removable spring bars positioned horizontally within the case lugs. Using a standard spring bar tool, compress the internal spring of the bar to extract it from its seat. Position the new strap within the lugs and reinsert the bar until it clicks securely. The operation is straightforward but requires care to avoid damaging the case finish. If inexperienced, professional assistance is recommended.

Which aftermarket straps are definitively compatible with the Tudor Black Bay One 79643-0006?

All straps with a 19mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> are mechanically compatible. On milanostraps.it you will find a curated selection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-19mm">19mm straps</a> crafted with premium leathers (vegetable-tanned calf, <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a>, alligator), contrast stitching and stainless steel <a href="/pages/termine-glossario/deployante">deployante</a> or buckles. Compatibility is guaranteed by matching lug width specifications.

What is the typical lifespan of a leather strap for the Tudor Black Bay One 79643-0006?

A quality leather strap used daily maintains its aesthetic appeal for 2–4 years before showing visible signs of wear (patina, natural creasing, thinning). Longevity depends on tanning method density, moisture exposure and frequency of use. Premium leathers such as <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> or vegetable-tanned calf age beautifully, developing character over time. Regular maintenance (drying, conditioning) significantly extends strap life.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only